Engine-driven pump



Sept. 1, 1942. l.. HATHAWAY ETAL- ENGINE-DRIVEN PUMP Filed June 9, 19412 Sheets-Sheet l l 'fnvanls Zawrerwa aZ'aw QW fo-1@ 22am W50.

Sept. 1, 1942. L.. HATHAWAY Er'Al. 2,294,454 I ENGINE-DRIVEN PUMPPatented Sept. 1, 1942 "rra .sr

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ENGINE-privati PUMP Lawrence Hathaway and John Thomas Wooddisse,Coventry, England, assignors to Coventry Climax Engines Limited,Coventry, England Application June 9, 1941, Serial No. 397,336

In Great Britain November 8, 1940 6 Claims.

This invention relates to an engine-driven pump, particularly forfire-lighting purposes, of

`the kind having a cooling system, for the engine,

which involves sending some of the water being pumped by the pumpthrough a heat-exchanger associated with the engine, Vor directlythrough the engine jacket. rI'he supply of such cooling water from thepump is under the control of a valve, and this must be closed when thepump is being started up, in order to allow of the priming of thelatter. In addition, a priming means is provided having a valve by meansof which it can be connected with the pump for priming purposes.

(It may here be mentioned that it has already been proposed that a valvefor connecting a priming means, of the exhaust-gas-ejector type, withthe pump and a valve for controlling the action of theY ejector shouldbe interconnected `for operation by a common control.)

lIt is found that in some cases users of the unit have forgotten to openthe valve, controlling the supply of cooling water from the pump, whenpriming has been effected, in consequence of which the engine becomesover-heated, with disadvantageous results. In other cases the valve hasnot been closed when the pump was to be primed, with the result thatpriming could not be eiected.

It is our main object to provide a simple remedy which will obviatethese defects.

It is a further object to arrange for the valve controlling the supplyof cooling water from the pump, and the valve controlling the connectionof the pump to the priming means, to be interconnectedsuch that a single-control will close one of the valves and open the other, and viceversa.

In applying the invention to a unit of the kind in which the engine iscooled on the intercooler system, we may mechanically connect themovable element of the valve, controlling the supply of cooling waterfrom the pump to the coiled pipe of the inter-cooler tank, with themovable element of the valve controlling the connection of the primingmeans to the pump, the arrangement preferably being such that in movingthe common control the rst of these valves will be entirely closedbefore the second of the valves starts to open.

In a preferred arrangement, however, we group the valves together anduse a common rotary valve element having appropriate transverse boreswhich co-operate,"respectively, with the two passages in a combinedvalve body in the manner specified. Thus, we may make use of a castingwith the necessary passages therein communicating with a common bore inwhich the rotary valve element is disposed tobe worked by a controllever.

Fora better understanding of the objects and advantages of the inventionattention should be directed to the following description in whichreference is made to the accompanying sheets of drawings, wherein:

Figure l is a part-sectional diagrammatic View oi an engine-driven pump,the engine of which is cooled by the inter-cooler system, adaptedaccording to the invention, though, in point of fact, the pump is in themain omitted, only the bulkhead or panel between it and the engine beingshown;

Figures 2 and 3 are elevations at right angles to one another mainly ofthe upper half of the pump and the control valve of the invention; and

Figure 4 is a sectional plan of the control valve.

The drawings show at I0 an internal-combus tion engine of anyappropriate form adapted to drive a coaxially-disposed pump I2 of thecentriiugal type having a volute chamber part of which is indicated atI3. The engine is cooled by water being circulated through its jacketand through an inter-cooler tank lll, l5 indicating the outlet pipe fromthe engine jacket to the inter-cooler tank and I6 the return pipe fromthe latter to the engine jacket. The intercooler coil l'l is supplied bythe pipeline l8 and exhausts along the pipeline 19, the pipe i8receiving water at 20 from the pump outlet.

The priming of the pump is eiected by an exhaust-gas-ejector, indicatedat 2l, which is of known form. The exhaust manifold 22 of the engine canconnect with a Venturi tube 23 to the annular space around which, at2,is connected a suction pipe 25 leading to the inlet or suction side 26of the pump.

The normal exhaust from the engine takes place along the exhaust pipev2'I. When priming is to be effected the clapper valve 28 is moved tothe position indicated by the chain line 28a to close the exhaust pipe 2and the exhaust gases then pass through the Venturi tube 28, servingYfor evacuating air from the pipe 25.

The clapper valve 28 is operable bv a hand lever 3| which is connectedwith the valve by an arm 32 and link 33 and -is biased to the positionshown by means of a spring 35. 31, 38 represent flanges to which thepump delivery valves (a pair in this instance) are connected.

In the present arrangement the pipeline I3 and the pipeline 25 arebrought beside one another in the vicinity of the bulkhead or panel 39between the engine and the pump, and the ow in these pipes is controlledVby a common rotary valve element 4l on which the hand lever 3-| isfast. In Figure 1 the valve casing 42 is show-n as having a Ypair ofstraight-through passages leading to the tapered bore in which thetapered rotary element 4I is disposed, but in practice it is moreconvenient for the passages in the valve casing to be right angled, asindicated by Figures 2 to 4:. The rotary element has two through bores43 which are, as shown most clearly in Figure 4, at right angles to oneanother and are positioned along the element to connect, respectively,with the two passages for thev pipes I8 and in the Valve casing 32. Pins45 (Figure 4) carried by the valve casing coact with an appropriateabutment (indicated at 45) on the rotary element to limit the movementof this to 90 degrees to bring one or other of the bores i3 intooperative relation with its associated passage.

With the hand lever 3l in the position shown the priming passage 25 isclosed, the main exhaust pipe 2l is open, and cooling water is beingsupplied by the pump along the pipeline I8 to the coil I'I of theinter-cooler tank, thus preventing the engine from over-heating, thisbeing the normal position of the lever 3| when the engine is working.When starting up, however, no cooling water is supplied to theinter-cooler coil, as this is not necessary when starting up, or can beomitted for the short period while priming is being effected; but thehand lever 3I, being turned through 90 degrees, the pipeline I is Closedand the priming pipe 25 is open, whilst, in addition, the main exhaustpipe 2'1 is closed so that the exhaust gases pass through the Venturitube 23 and by ejector action introduce a flow of air along the pipe 25,thus priming the pump. Once priming has been completed the hand lever 3|can be returned to its normal position, as shown in the drawings. Aspreviously mentioned, it is biased in this position and should thereforebe held in the priming position for the short period during whichpriming takes place, when the engine will not be positively cooled.

Thus, by means of the invention it is impossible for the water coolingValve (pipe I8) to be inadvertently left closed after the pump has beenprimed, or for anyone to attempt the priming of the pump without rstclosing the pipe I8 and then opening the priming pipe 25.

Whilst for the sake of simplicity we have shown the combined valve unitmounted on the panel 39, it will be obvious that it could be mountedwherever convenient. For example, if mounted directly on the volute bodyI3 of the pump some of the passages could be cored in the pump body,thus eliminating some of the copper pipes and joints between the pumpand valve unit.

What we claim as our invention and desire to secure by Letters Patent ofthe United States is:

l. In combination, a motor, a cooling means for the motor, a pump drivenby the motor, a normal exhaust for the motor, a secondary exhaust forthe motor, exhaust valve means to open and close the normal exhaust, asuction device in the secondary exhaust, a priming conduit connectingthe suction device and pump, a liquid conduit connecting the coolingmeans and the exhaust of the pump, coordinate valve means in theconduits to open and close same only alternately, and operating meansboth for the exhaust valve means and coordinate Valve means adapted tocause the exhaust valve means to close and open the normal exhaustsimultaneously with the opening and closing of the priming conduit.

2. The combination of claim 1 characterized by biasing means coupled tothe operatingmeans to bias the parts to non-priming position.

3. 'I'he combination of claim 1 characterized by biasing means coupledto the operating means to bias the parts to non-priming position, saidoperating means having a part for manually shifting the same to primingposition.

4. The combination of claim 1 in which the coordinate valve means arerigidly connected to the operating means and both are remote from theexhaust valve means', with linkage connection between the operating andexhaust Valve means, the operating means having a manual part forengagement to move the operating means to a priming position, andbiasing means acting reversely on the operating means to bias the partsto a non-priming position.

5. In an angine driven pump, an engine having an exhaust pipe, .anintercooler for the engine and pump, an exhaust gas ejector pump primingmechanism operatively connected to the engine exhaust pipe, a conduitconnecting the priming mechanism to the pump, a two position valvedisposed in the operative connection between the priming mechanism andengine exhaust pipe to open and close communication between the primingmechanism and engine exhaust pipe, a two way, two position Valvemechanism controlling the conduit between the pump and intercooler andthe conduit between the priming mechanism and pump, said Valve mechanismin one position opening the intercooler conduit and closing the primingconduit and in its other position closing the intercooler conduit andopening the conduit to the priming mechanism, a control lever to movethe valve mechanism to one or the other of its positions, and meansoperatively interconnecting the two position valve and the control leverto close the two position valve when the valve mechanism control leveris in its irst named position and to open the two position valve whenthe Valve mechanism control lever is in its second named position.

6. In an engine driven pump, an engine having an exhaust pipe, anintercooler for the engine and pump, an exhaust gas ejector pump primingmechanism operatively connected to the engine exhaust pipe, a conduitconnecting the priming mechanism to the pump, a two position valvedisposed in the operative connection between the priming mechanism andengine exhaust pipe to open and close communication between the primingmechanism and engine exhaust pipe, a two way, two position valvemechanism controlling the conduit between the pump and intercooler andthe conduit between the priming mechanism and pump, said valve mechanismin one position opening the intercooler conduit and closing the primingconduit and in its other position closing the intercooler conduit andopening the conduit to the priming mechanism, a control lever to movethe valve mechanism to one or the other of its positions, and meansoperatively interconnecting the two position valve and the control leverto close the two position valve when the valve mechanism control leveris in its rst named position and to open the two position valve when thevalve mechanism control lever is in its second named position, and meansbiasing the control lever and valve mechanism to its rst named position,Y

LAWRENCE HATHAWAY. JOHN THOMAS WOODDISSE.

